Converting an Integer to String (C)

Question

I'm fairly new to c and have been trying to figure out how convert an integer into a string of numbers, and this i what i have so far:

long long int inputNum = 0;
char str [20];
int len = 0;

printf("Please enter the integer to be converted,\nit should be no more than 10 digits long: \n");
scanf("%d", &inputNum);
sprintf(str,"%d", inputNum);

len = strlen(str);

printf("%d", len);

return 0;

However im encountering an issue were if the int entered is more than 10 characters long the program will still say that the lenght is 10. Im not sure if this is an issue with data types (long long int for example) or if im just implementing the string impoperly.

len=sprintf(str,...

BLUEPIXY
– BLUEPIXY

2014-02-16 22:43:44 +00:00
Commented Feb 16, 2014 at 22:43 — BLUEPIXY
– BLUEPIXY, Commented Feb 16, 2014 at 22:43
scanf("%lld", &inputNum); printf("%lld", inputNum);

chux
– chux

2014-02-16 23:37:58 +00:00
Commented Feb 16, 2014 at 23:37 — chux
– chux, Commented Feb 16, 2014 at 23:37
print out the converted string and you'll know why

phuclv
– phuclv

2014-02-17 00:18:57 +00:00
Commented Feb 17, 2014 at 0:18 — phuclv
– phuclv, Commented Feb 17, 2014 at 0:18

dandan78 · Accepted Answer · 2014-02-16 21:33:47Z

3

Your format specifier is wrong. %d is used for regular int variables. Yours is a long long int. Use %lld instead and it should work just fine.

Also, you should be aware that exactly how many digits an int can store is platform-dependant. In your case, it's probably 32 bits, which works out to a range of approx -2^31 to 2^31. Likewise, a long long is 64 bits long, with analogous constraints. What I'm saying is that you're going to need a different solution for an arbitrary number of digits.

edited Feb 16, 2014 at 21:33

answered Feb 16, 2014 at 21:04

dandan78

14.1k13 gold badges68 silver badges82 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Converting an Integer to String (C)

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related